Armature for electro-magnets



(No Model.) 2 Sheets-Sheet 1. O. A. GAISER.

. I ARMATURE FOR ELEGTRO MAGNETS.

No. 333,343, I v Patented Feb. 22,1337.

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G. A. GAISER.

ARMATURE FOR ELEGTRO MAGNETS. No. 358,343. PatentedFeb. 22, 1887.

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w nvggg g CMALSAGQVSQ l/VVEA/TUR W 33 7 Afforneys Y UNITED STATES PATENT OFFICE.

CHARLES A. GAISER, OF EDVVARDSVILLE, ILLINOIS.

ARMATURE FOR ELECTRO-MAGNETS.

SPECIFICATION forming part of Letters Patent No. 358,343, dated February 22, 1887.

Application filed March 13, 1886. Serial No. 195,108.

To all whom it may concern.-

Be it known that 1, CHARLES A. GAISER, of Edwardsville, in the county of Madison and State of Illinois, have invented certain new and useful Improvements in Armatures for Electro-liiagnets; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in armatures for electro-magnets in which one or more thin metal sheets or plates are secured edgewise. to the armature-levers and have the ends thereof coiled or bent flatwise to surround, without contact, the magnet-cores, to the end that according to the width of these armature sheets or plates any desired length of movement may be had. By reason of the area of surface exposed to the attraction of the magnet-cores anydesired power may be had in the armatures, and by reason of the thinness of the metal of the armature coils the latter are quickly magnetized or demagnetized. The armature sheets or plates being of, uniform thickness, themetal in the coils thereof is distributed equally around the magnet-cores, resulting in an equal attraction toward all parts of the armature-coils.

In the accompanying drawings, Figure 1 is a side elevation of an armature made of a single piece of sheet metal embodying my invention. Fig. 2 is a plan view of the same. Fig. 3 is a plan view of an armature made of three plates arranged side by side. Fig. 4 is an elevation in transverse section on the line was, Fig. 3. Figs. 5 and 6 correspond in sectional line with Fig. 4, but show a different arrangement of the metal sheets, and also show the position of the armatures relative to the magnet-core. Fig. 7 is a top plan, and Fig. 8 a cross-section, on the line yy, Fig. 7, showing an auxiliary loop over the head of the magnetcore. Figs. 9, 10, and 11 are side elevations showing different forms of metal sheets from which the armatures shown in Figs. 7 and 8 may be made. Figs. 12 and 13 are plan views showing different construct-ions of the armatures.

In Fig. 1 is shown an armature made of a single rectangular piece of sheet or thin plate metal, bent at the ends into loops or thimbles No model.)

construction, though for many purposes preferable to the solid armatures previously used, had objectionable features-to wit, the armatures, unless made so heavy and cumbersome as would likely interfere with the quick movement required, did not present enough surface next to the magnet-core for the attractive force of the cores to act upon, and not much movement could be given to the armatures, for the reason that the neutral line of attraction would be reached soon after the core protruded above the armature. These armatures if broadened to give more surface, the lines of attraction for the outer portions of the armaturecores were too oblique to the axis of the core to have much force, the obliquity of such lines from opposite sides having a tendency to neutralize each other. Vith my improved construction these difficulties are overcome. The broad thin sheet metal adjacent to the respective cores being in circular planes concentric and parallel with the axial line of the respective cores may present, according to the area, any desired surface for the attractive force of the cores to act upon, and at the same time can be made extremely light; also, by reason of the great width of metal in the direction of the line of motion a longer stroke may be had without the core protruding beyond the armatures, and consequently without the armatures reaching the neutral line of attraction; also, the lines of attraction from the head of the core are less oblique, and consequently more effective. If an armature of greater power is desired than can be had by the single metal sheet shown in Figs. 1 and 2, such sheet may be doubled, tripled, or increased in number indefinitely.

In Figs. 3 and 4 is shown an armature of ICO three sheets. These maybe arranged with the edges even, as shown in Fig. 4,01 otherwise, as shown in Figs. 5 and 6. These armatures may be attached in any suitable manner to the levers H,on which they operate. For some purposes, when a comparatively short and rapid movementis required,an auxiliaryloop or ring, a, may be had, located directly over thehead of the core, the same being a continuation of the broader loop or thimble, a, but narrow in the direction of the line of motion. The loop or ring a gives additional and direct lines of attraction from the head of the core, and has this advantage over a solid head or end to the loop or ring a, to wit: A space is left between the loop or ring a and thimble a, through which may be seen the core in adjusting the instrument.

In making the armatures with the auxiliary loop or ring a the metal blank, or if more than one plate is used, the blank for the inner plate, may be of the form shown in Fig. 9, in which the tongue 0 is sufficient to form the loop or ring a, and the part from the shoulders c to the dotted lines 0 is for the thimble a; or, in place of notching the metal sheets, thereby causing waste of material, a narrow plate, 0, of suitable width for the loop or ring a, and plate C,-wide enough to form the balance of the armature, may be used, the two plates being set together edgewise, as shown in Fig. 10.

If preferred, three or more narrow strips, 0, may be set edgewise, as shown in Fig. 11, in which case but one kind of material would be necessary, the upper pieces being out large enough to form the loop or ring a.

The armature might be constructed of two sheets, as shown in Fig. 12; but the additional weight, by reason of the extra sheet through the central portion of the armature,would be objectionable. If preferred, the ends of the loop or ring a might be closed, forming tubes, as shown in Fig. 13; but such construction would incur extra expense and would proba- 5 bly give no better results.

What I claim is- 1. The COIllblllillllOll,Wltll an eleetro-magnet having a projecting core or pole, of an armature consisting of thin metal arranged in a plane parallel with the axis of the magnet core or pole and concentrictherewith, substantially as set forth.

2. The eombinatiomwith an eleetro-magnet having a projecting core or pole, of an armature composed of two or more thin metal loops or rings of thin metal arranged in planes parallel with the axis of the magnetcore and concentric or substantially concentric there with, substantially as set forth.

3. The combination ,with an armature for an electro-magnet, the same consisting of thin metal arranged in planes parallel with the axes of the magnet-cores, and having ends shaped to pass outside the core, of an auxiliary loop or ring integral with the inner armature-plates, said auxiliary loop or ring being located directly over the head of the magnet-cores, substantially as set forth.

4. The combinatiomwith an armature for an electromagnet, the same consisting of one or more thin sheets of metal set in planes paral lel with the axes of the magnet-cores, said sheets being made to pass outside of the cores without contact with the latter, of an auxiliary loop or ring located opposite the head of the cores, said coil being connected with and forming a part of the armature, but leaving open spaces for the inspection and adjustment of the core and arinatures, substantially as set forth.

5. An armature consisting of thin metal arranged in a plane parallel with the axis of the magnet core or pole and concentric therewith, substantially as set forth.

In testimony whereof I sign this specification, in the presence of two witnesses, this 3d day of February, 1886.

CHARLES A. GAISER.

\Vitnesses:

CHAS. H. DORER, Geo. W. KING. 

